Combustion-promotion device



Patented Sept. 24, 1929 I l UNITED srarss Parleur i OFFICE ALBERTFRENCH, OF BROOKLYN, NEW YORK coMBUsTIoN-PRoMoTIoN Ynnvrcn Appncaaon meaMarch 17,A 1927. vser'iaim. 175,978.v

The objects of this invention are to proinner side of the lire door 11as this promote combustion of fuel in burners and furvides a convenientmounting for supporting naces and to provide effective means for thisitat a proper level to mix the preheated air purpose in a form which canbe readily apn with the burning and unburned gases.` It

5 plied and adapted to use in existing fuel burn- Will heV understood,however, that it may be, 55

ing systems. supported 1n any other suitable way. The

In the accompanying drawing forming particular means of support shownconsists part of this specification, one simple, practiof a nipple 12extendingr through the door cal embodiment of the invention is illusandentering a screw seat 13 at the upper u) trated. lt should beunderstood, however, yend of the outer arm of the U-shaped chan- 60 thatthe invention may be applied and used D el. This nipple provides aninlet for the in other ways and in other structural forms all and at theoutside of the door Serves as without departure from the true spirit andu Support forthe funnel shaped air receiver broad scope of the inventionas hereinafter 14. Thls all' inlet or rosette is shown Y l5 defined andclaimed. equipped at the front with a rotatably ad- 65 Figure 1 is asectional view of the fire door justable Vane 0r damper 15, which may beof a furnace showing two of the preheatcrs Set t adjust the volume ofair admitted. applied thereto, one appearing in plan and Heat absorbingribs or fins are shown on the other partly broken away and in section.'that poltlon of the body of the device which lo Figure 2 is a verticalsectional view as on 1S exposed to the fire, at 16, the purpose of 70line 2 2 of Figure 1. fthese belng to aid in heating the U-shaped Thepresent invention comprises an air pre- Channel and falli Shaped all'discharge. The heating device for spraying preheated air hOllOwprojection of the cap is directly exover a fuel bed to combine and burnwith the pOSed to the fire and heats the entirek top unconsumed gases inthe furnace chamber. pOItiOn of the U-shaped passage. It will 15 In theillustration this air preheater conbe noted that theA U passage isformed with sists of a hollow open casting 3 having a subeasy bends sothat the incoming air is not stantially horizontal upper edge 4; onwhich choked back by being forced to change its rests a top or cap 5having within its borders direction at sharp angles. A natural inadependent hollow projection 6 spaced from ward How is therefore producedwithout reso and forming with the inner wall of the holtarding it anymore than is necessary to low casting a substantially U-shapedchanproperly take up the heat. The expansion nel 7. These cooperatingwalls are shown as permitted by the fan shaped enlargement at shaped toproduce a channel which is rela the end of the U passage and the taperedtively flat in cross section and which widens nozzles cause the air tobe sprayed With ap- ,sa toward the rear upwardly into a fan shapepreciable force and therefore to reach all at 8 where there are locateda number of subportions of the fuel bed or flame.

stantially radially axrranged tapered nozzles By regulating the damper15, the volume 9 extending approximately horizontally and and flow ofthe combustion supporting air having flaring mouths 10 at the outer endsmay be regulated to suit any particular re- `90 of the same. Thesedischarge nozzles are quirements. This damper thus ,controls to shown asformed in the body portion of the an extent the force with which thepreheated device practically at the upper end of the air is injectedinto the furnace chamber and U-shaped channel. They may be precast ormay be used to determine this injector acmachined in the body or coveror partly in tion. The damper or other supporting wall 95 both and theyform, with the fan shaped through which the nipple extends may bechamber at the upper end of the channel, of double thickness, ascustomary in such means for spraying the air in fine streams structuresand the screw-threads on the opover the entire fuel bed or flame. positeends of the same are preferably long The device is shown as supported onthe enough to permit the air inlet member at 100 the outside to bescrewed into abutting engagement with the outer face of the door and theair preheater to be screwed into abutting engagement with the inner faceof 5 the door so that both are firmly interlocked and supported iXedlyin proper relation.

What is claimed is: 1. An injector preheater having a substantiallyU-shaped air inlet passage terminat- 10 ing in radially disposed airdischarge nozzles,

said nozzles being tapered toward their discharge ends and formed withflared exits.

2. An injector preheate'r havingv a substantially lU-shaped air inletpassage with a l fan shaped chamber at the discharge` end ,thereof and`substantially radially disposed `nozzles in communication with saidchamber, said nozzles being tapered from their 4discharge ends toaccelerate the discharge of 29 :heated air.

iil() 3. An air preheater of the character disclosed, comprisinga'hollow body open at the top anda vcap applied over and closing theopen top portion of said body, said cap having a dependent hollowprojection extending down into` the hollow body and cooperating with theinner walls of said hollowbody to form a substantially U-shaped channelwithin the hollow body and said hollowI projection in the cap being openat the top v'and forming in the cap aheat absorbing cavity lying withinthe general ontlines of the body, the channel formed within the bodyhaving an air inlet at one end and terminating in a discharge nozzle atthe other end, the heat cavity within the cap being disposed in betweensaid air inlet and discharge nozzle.

u In witness whereof, I have hereunto set LU my hand this l7th day ofMarch, 1927.

j ALBERT FRENCH.

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